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DOI: 10.1039/A900744J (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 2015-2020

Synthesis and structure of uranium(III) complexes with dihydrobis(pyrazolyl)borates

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Leonor Maria, Maria Paula Campello, Ângela Domingos, Isabel Santos and Richard Andersen

Abstract

The synthesis of the novel uranium(III) complexes [UI2{H2B(3tBu,5Me-pz)2}(THF[hair space])2] 1, [UI2{H2B(3tBu,5Me-pz)2}(OPPh3)2] 2 (3tBu,5Me-pz = 3-tert-butyl-5-methylpyrazolyl) and [U{Ph2B(pz)2}3] 3 are reported. The molecular structures have been determined by single crystal X-ray diffraction. In monomeric complexes 1 and 2 the UIII is seven-co-ordinated by the two pyrazolyl nitrogens, the two iodides and two oxygen atoms of the neutral ligands and by an agostic B–H[hair space][hair space]· · ·[hair space][hair space]U interaction. In monomeric 3 the uranium is six-co-ordinated by the nitrogen atoms of the chelating Ph2B(pz)2 ligands which are arranged in a trigonal prismatic geometry around the uranium.

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